Which of the following is an assumption made while constructing a production possibilities frontier [PPF]?

Some sales managers are talking sho

A) "Since our competitors raised their prices our sales have doubled." B) "It has been an unusually mild winter; our sales of wool scarves are down from last year." C) "We decided to cut our prices, and the increase in our sales has been remarkable." D) none of the above

The majority of blacks were shipped from West Africa, but some also came from Madagascar and Zanzibar

Indicate whether the statement is true or false